I was young and dumb enough then not to know that, for example, 7-Up and Sprite were not independent soft-drinks. I assumed every flavor of soda was its own company. I soon started to notice the drink pattern based on whether they had Coke or Pepsi. Those two owned all the other flavors—and they each had their own variant of the other's.

I was told too by management that we only bought Pepsi drinks. Again, native me thought, "Why not have both Coke and Pepsi and let the customer decide?" I am not sure whether there was a pricing issue that prevented management from buying both—like the loss of a discount for going Coke-only or whatever.

Of course you always saw signage, etc. around the restaurant with Pepsi logos (or Coca-Cola logos at other restaurants) so you knew there were gifts in other forms that one of the two would entice the owner with.

What a slow growing up I have gone through since then. It seems like the kind of thing they ought to teach in primary education.